1,4-Bis (substituted-amino)-5,8-dihydroxy-anthraquinones and leuco bases thereof

ABSTRACT

This disclosure describes symmetrical 1,4-bis (substituted-amino)-5,8-dihydroxyanthraquinones useful as chelating agents and for inhibiting the growth of transplanted mouse tumors.

CROSS REFERENCE TO RELATED APPLICATION

This application is a division of our copending application Ser. No. 923,602, filed July 11, 1978, now U.S. Pat. No. 4,197,249, which is a continuation-in-part of our abandoned application Ser. No. 873,040, filed Jan. 30, 1978, which is a continuation-in-part of our abandoned application Ser. No. 824,872, filed Aug. 15, 1977.

BRIEF SUMMARY OF THE INVENTION

This invention relates to new organic compounds and, more particularly, is concerned with novel symmetrical 1,4-bis(substituted-amino)-5,8-dihydroxyanthraquinones which may be represented by the following general formula: ##STR1## wherein Q is a divalent moiety selected from the group consisting of those of the formulae: ##STR2## wherein n is an integer from 2 to 4, inclusive; R₁ and R₂ are each individually selected from the group consisting of hydrogen, alkyl having from 1 to 4 carbon atoms, monohydroxyalkyl having from 2 to 4 carbon atoms and wherein the carbon atom alpha to the nitrogen atom may not bear an hydroxy group, dihydroxyalkyl having from 3 to 6 carbon atoms and wherein the carbon atom alpha to the nitrogen atom may not bear an hydroxy group, formyl, alkanoyl having from 2 to 4 carbon atoms, trifluoroacetyl and moieties of the formulae:

    --(CH.sub.2).sub.n --CN, --(CH.sub.2).sub.n --O--R

and ##STR3## wherein n is an integer from 2 to 4, inclusive, R is alkyl having from 1 to 4 carbon atoms, and R₃ and R₄ are each individually selected from the group consisting of hydrogen, alkyl having from 1 to 4 carbon atoms, and monohydroxyalkyl having from 2 to 4 carbon atoms and wherein the carbon atom alpha to the nitrogen atom may not bear an hydroxy group, and R₃ and R₄ taken together with their associated N(itrogen) is morpholino, thiomorpholino, piperazino, 4-methyl-1-piperazino or a moiety of the formula: ##STR4## wherein m is an integer from 2 to 6, inclusive; with the first proviso that the ratio of the total number of carbon atoms to the sum of the total number of oxygen atoms plus the total number of nitrogen atoms in the side chains at the 1-position and the 4-position may not exceed 4 and with the second proviso that R₁ and R₂ may not both be hydrogen or alkyl. Suitable monohydroxyalkyl and dihydroxyalkyl groups contemplated by the present invention are, for example, β-hydroxyethyl, β-hydroxypropyl, γ-hydroxypropyl, 2,3-dihydroxypropyl, 2,4-dihydroxybutyl, and the like. Also included within the purview of the present invention are the leuco bases and tautomers thereof which may be represented by the following general formulae: ##STR5## wherein R₁, R₂ and Q are as hereinabove defined.

DETAILED DESCRIPTION OF THE INVENTION

The novel compounds of the present invention are obtainable as reddish brown to blue black crystalline materials having characteristic melting points and absorption spectra and which may be purified by leaching with lower alkanols since many of the free bases are soluble in water and some of them are insoluble in most organic solvents. The organic bases of this invention (I, II and III) form non-toxic acid-addition salts with a variety of pharmacologically acceptable organic and inorganic salt-forming reagents. Thus, acid-addition salts, formed by admixture of the organic free base with 1,2 or up to eight equivalents of an acid, suitably in a neutral solvent, are formed with such acids as sulfuric, phosphoric, hydrochloric, hydrobromic, sulfamic, citric, lactic, malic, succinic, tartaric, acetic, benzoic, gluconic, ascorbic, and the like. For purposes of this invention the free bases are equivalent to their non-toxic acid-addition salts. The acid-addition salts of the organic bases of the present invention are, in general, crystalline solids, relatively soluble in water, methanol and ethanol but relatively insoluble in non-polar organic solvents such as diethyl ether, benzene, toluene, and the like.

The novel compounds of the present invention may be readily prepared in accordance with the following reaction scheme: ##STR6## wherein R₁, R₂ and Q are as hereinabove defined. In accordance with this reaction scheme, leuco 1,4,5,8-tetrahydroxyanthraquinone (IV) is condensed with an appropriate alkylene diamine (V) in a solvent such as N,N,N',N'-tetramethylethylenediamine, methanol, ethanol, water, dimethylformamide, or mixtures thereof at from about 40° C. to about 60° C. under an atmosphere of nitrogen for several hours to produce the corresponding leuco bases (II). The leuco bases (II) may be readily oxidized to the fully aromatic derivatives (I) by a variety of methods such as air oxidation or treatment with hot nitrobenzene, or treatment with chloranil, hydrogen peroxide, or sodium perborate.

The novel compounds described herein are useful as chelating, complexing or sequestering agents. The complexes formed with polyvalent metal ions are particularly stable and usually soluble in various organic solvents. These properties, of course, render them useful for a variety of purposes wherein metal ion contamination presents a problem; e.g., as stabilizers in various organic systems such as saturated and unsaturated lubricating oils and hydrocarbons, fatty acids and waxes, wherein transition metal ion contamination accelerates oxidative deterioration and color formation. They are further useful in analyses of polyvalent metal ions which may be complexed or extracted by these materials and as metal carriers. Other uses common to sequestering agents are also apparent for these compounds. In addition, the leuco bases (II) are useful as intermediates in the preparation of the fully aromatic derivatives (I).

The novel compounds of the present invention also possess the property of inhibiting the growth of transplanted mouse tumors as established by the following tests.

Lymphocytic leukemia P388 test

The animals used are DBA/2 mice all of one sex, weighing a minimum of 17 g. and all within a 3 gram weight range. There are 5 or 6 animals per test group. The tumor transplant is by intraperitoneal injection of 0.1 ml. of dilute ascitic fluid containing 10⁶ cells of lymphocytic leukemia P388. The test compounds are administered intraperitoneally on days one, 5 and 9 (relative to tumor inoculation) at various doses. The animals are weighed and survivors are recorded on a regular basis for 30 days. The median survival time and the ratio of survival time for treated (T)/control (C) animals are calculated. The positive control compound is 5-fluorouracil given as a 60-mg./kg. injection. The results of this test with representative compounds of the present invention appear in Table I. The criterion for efficacy is T/C×100≧125%.

                                      TABLE I     __________________________________________________________________________     Lymphocytic Leukemia P388 Test                        Dose Median Survival                                      T/C × 100     Compound           mg./kg.                             Time (Days)                                      (Percent)     __________________________________________________________________________     Leuco-1,4-bis[(2-dimethylamino-                        100  24.5     245     ethyl)amino]-5,8-dihydroxy-                        50   24.5     245     anthraquinone      25   19.0     190                        12   17.5     175                        6    16.0     160                        3    14.5     145                        1.5  13.0     130     Control            0    10.0     --     5-Fluorouracil     60   19.0     190     1,4-Bis[(2-dimethylaminoethyl)-                        50   25.0     278     amino]-5,8-dihydroxy-anthraquinone                        25   20.5     228                        12   23.0     256                        6    21.0     233                        3    19.5     217     Control            0    9.0      --     5-Fluorouracil     60   19.5     217     Leuco-1,4-bis(2-morpholinoethyl-                        200  13.0     137     amino)-5,8-dihydroxy-anthraquinone                        100  12.0     126                        50   11.0     116                        25   12.0     126     Control            0    9.5      --     5-Fluorouracil     60   19.5     205     1,4-Bis(2-morpholinoethylamino)-                        200  14.0     147     5,8-dihydroxy-anthraquinone                        100  12.0     126     Control            0    9.5      --     5-Fluorouracil     60   19.5     205     Leuco-1,4-bis[(2-diethylamino-                        200  17.0     179     ethyl)amino]-5,8-dihydroxy-anthra-                        100  17.0     179     quinone            50   15.0     158                        25   13.0     137                        12   12.0     126     Control            0    9.5      --     5-Fluorouracil     60   19.5     205     1,4-Bis[(2-diethylaminoethyl)-                        200  20.0     210     amino]-5,8-dihydroxy-anthraquinone                        100  18.0     189                        50   15.0     158                        25   16.0     168                        12   12.0     126     Control            0    9.5      --     5-Fluorouracil     60   19.5     205     Leuco-1,4-bis[[2-(1-pyrrolidinyl)-                        200  23.0     209     ethyl]amino]-5,8-dihydroxy-anthra-                        100  19.0     173     quinone            50   16.0     145                        25   15.0     136     Control            0    11.0     --     5-Fluorouracil     60   20.0     182     1,4-Bis[[2-(1-pyrrolidinyl)ethyl]-                        100  24.0     218     amino]-5,8-dihydroxy-anthraquinone                        50   23.0     209                        25   21.0     191                        12   18.0     164     Control            0    11.0     --     5-Fluorouracil     60   20.0     182     1,4-Bis[(3-dimethylaminopropyl)-                        50   15.5     129     amino]-5,8-dihydroxy-anthraquinone                        25   15.5     129                        12   15.0     125     Control            0    12.0     --     5-Fluorouracil     60   19.5     162     Leuco-1,4-bis[(2-aminoethyl)-                        100  19.0     158     amino]-5,8-dihydroxy-anthraquinone                        50   23.0     192                        25   19.0     158                        12   18.0     150     Control            0    12.0     --     5-Fluorouracil     60   19.5     162     Leuco-1,4-bis(3-aminopropylamino)-                        200  18.0     150     5,8-dihydroxy-anthraquinone                        100  18.0     150                        50   16.0     133                        25   18.0     150                        12   16.0     133     Control            0    12.0     --     5-Fluorouracil     60   19.5     162     Leuco-1,4-bis[2-(2-methylamino-                        200  2.0        18.0     ethylamino)ethylamino]-5,8-dihy-                        100  26.0       236.0     droxyanthraquinone 50   28.0       255.0                        25   21.0       191.0                        12.5 16.0       145.0                        6.2  15.0     136     Control            0    11.0     --     5-Fluorouracil     60   17.0     170     Leuco-1,4-bis[2-dimethylaminopro-                        200  18.0     200     pylamino]-5,8-dihydroxyanthraqui-                        100  15.0     167     none               50   14.0     156                        25   13.0     144                        12.5 11.0     122     Control            0    9.0      --     5-Fluorouracil     60   18.5     206     1,4-Bis[2-(2-hydroxyethylamino)                        12.5 13.0     130     ethylamino]-5,8-dihydroxyanthra-                        6.2  20.0     200     quinone Dihydrochloride                        3.1  22.0     220                        1.5  >29.0    >290                        0.78 >29.0    >290                        0.39 27.0     270                        0.19 25.0     250                        0.09 21.0     210                        0.04 20.0     200     Control            0    10.0     --     5-Fluorouracil     60   20.0     200     Leuco-1,4-bis[2-(1-piperazinyl)                        200  7.0       78     ethylamino]-5,8-dihydroxyanthra-                        100  21.0     233     quinone            50   16.0     178                        25   15.0     167                        12.5 14.0     156     Control            0    9.0      --     5-Fluorouracil     60   18.5     206     1,4-Bis[2-(methylamino)ethylamino]-                        25   9.0       86     5,8-dihydroxyanthraquinone dihydro-                        12.5 16.0     152     chloride           6.2  20.0     190                        3.1  22.0     210                        1.5  22.5     214                        0.78 18.5     176                        0.39 19.5     186                        0.19 18.5     176                        0.09 18.0     171                        0.04 17.0     162     Control            0    10.5     --     5-Fluorouracil     60   18.0     171     Leuco-1,4-bis[2-(2-hydroxyethylamino)                        25   12.0     114     ethylamino]-5,8-dihydroxyanthraquinone                        12.5 23.5     224                        6.2  23.0     219                        3.1  26.0     248                        1.5  >30.0    >286                        0.78 28.0     267                        0.39 22.0     209                        0.19 21.5     205                        0.09 21.5     205                        0.04 18.5     176     Control            0    10.5     --     5-Fluorouracil     60   18.0     171     Leuco-1,4-bis(4-aminobutyl-                        400  20.0     190     amino)-5,8-dihydroxyanthra-                        300  18.0     171     quinone            200  17.0     162                        100  14.0     133     Control            0    10.5     --     5-Fluorouracil     60   17.5     162     Leuco-1,4-bis[2-(methyl-                        50   6.0       55     amino)ethylamino]-5,8-                        25   19.0     173     dihydroxyanthraquinone                        12.5 19.0     173                        6.2  21.0     191                        3.1  15.0     136                        1.5  13.0     118     Control            0    11.0     --     5-Fluorouracil     60   18.5     168     Leuco-1,4-bis[2-(2-isopropyl-                        100  8.0       73     amino)ethylamino]-5,8-dihy-                        50   19.0     173     droxyanthraquinone 25   17.0     155                        12.5 15.0     136     Control            0    11.0     --     5-Fluorouracil     60   20.5     186     1,4-Bis[2-(2-aminoethylamino)                        200  17.0     162     ethylamino]-5,8-dihydroxyanth-                        100  16.0     152     raquinone          50   14.0     133                        25   13.0     124     Control            0    10.5     --     5-Fluorouracil     60   17.0     162     Leuco-1,4-[2-[di(β-hydroxy-                        200  19.0     190     ethyl)amino]ethylamino-5,8-                        100  17.0     170     dihydroxyanthraquinone                        50   16.0     160                        25   15.0     150                        12.5 13.5     135                        6.2  12.0     120     Control            0    10.0     --     5-Fluorouracil     40   18.0     180     1,4-Bis[2-(2-hydroxy-1-pro-                        25   12.0     120     pylamino)ethylamino]1,4-di-                        12.5 24.0     240     hydroxyanthraquinone dihy-                        6.2  23.0     230     drochloride        3.1  22.0     220                        1.56 19.0     190                        0.78 19.0     190                        0.39 17.5     175     Control            0    10.0     --     5-Fluorouracil     40   18.0     180     1,4-Bis[2,[2-(1-morpholino)ethyl-                        200  9.5       95     amino]ethylamino]5,8-dihydroxyan-                        100  20.0     200     thraquinone tetrahydrochloride                        50   18.5     185                        25   19.5     195                        12.5 15.0     150                        6.2  14.0     140                        3.1  13.0     130     Control            0    10.0     --     5-Fluorouracil     40   18.0     180     1,4-Bis[2-(3-hydroxy-1-propyl-                        25   8.5      77     amino)ethylamino]5,8-dihydroxy-                        12.5 >30.0    >273     anthraquinone dihydrochloride                        6.25 26.0     236                        3.1  25.0     227                        1.56 22.0     200                        0.78 21.5     195     Control            0    11.0     --     5-Fluorouracil     40   18.0     164     Leuco-1,4-bis[2-(3-hydroxy-1-                        200  14.0     127     propylamino)ethylamino]5,8-                        100  38.0     345     dihydroxyanthraquinone                        50   34.0     309                        25   22.0     200                        12.5 19.5     177                        6.25 16.5     150                        3.1  18.5     168                        1.56 19.5     177                        0.78 18.0     164     Control            0    11.0     --     5-Fluorouracil     40   17.0     155     1,4-Bis[2-[di(β-hydroxyethyl)-                        200  >30.0    >333     amino]ethylamino]5,8-dihydrox-                        100  22.0     244     yanthraquinone dihydrochloride                        50   20.5     228                        25   21.5     239                        12.5 18.5     206                        6.2  18.5     206                        3.1  19.0     211                        1.56 16.0     178                        0.78 14.5     161     Control            0    9.0      --     5-Fluorouracil     60   20.5     228     Leuco-1,4-bis[3-(2-hydroxy-                        200  33.5     305     ethylamino)-1-propylamino]-                        100  27.5     250     5,8-dihydroxyanthraquinone                        50   25.0     227                        25   18.5     168                        12.5 19.0     173                        6.25 18.0     164                        3.12 15.0     136     Control            0    11.0     --     5-Fluorouracil     40   17.5     159     Leuco-1,4-bis[2-(2-hydroxy-                        200  9.0      82     1-propylamino)ethylamino]-                        100  26.5     241     1,4-dihydroxyanthraquinone                        50   24.0     218                        25   20.5     186                        12.5 21.5     195                        6.25 20.0     182     Control            0    11.0     --     5-Fluorouracil     40   17.5     159     1,4-Bis[3-(2-hydroxyethyl-                        100  12.5     114     amino)-1-propylamino]5,8-                        50   32.0     291     dihydroxyanthraquinone                        25   26.5     241     dihydrochloride    12.5 22.5     205                        6.25 19.0     173                        3.12 19.0     173                        1.56 16.0     145                        0.78 15.0     136     Control            0    11.0     --     5-Fluorouracil     40   17.5     159     1,4-Bis[2-(1-aziridino)ethyl-                        100  28.5     285     amino]-5,8-dihydroxyanthra-                        50   21.5     215     quinone            25   20.0     200                        12.5 20.5     205                        6.25 18.5     185                        3.12 19.5     195                        1.56 17.0     170                        0.78 14.0     140     Control            0             --     5-Fluorouracil     60   20.5     205     1,4-Bis[2-(2-methylaminoethyl-                        100  22.0     220     amino)ethylamino]-5,8-dihydrox-                        50   22.0     220     yanthraquinone tetrahydrochloride                        25   19.5     195                        12.5 17.0     170                        6.25 16.0     160                        1.12 13.5     135                        1.56 13.0     130     Control            0    10.0     --     5-Fluorouracil     40   16.0     160     1,4-Bis(2-aminoethylamino)-                        12.5 8.0       73     5,8-dihydroxyanthraquinone                        6.2  15.5     141     dihydrochloride    3.1  30.0     273                        1.56 20.0     182                        0.78 24.5     223                        0.39 25.5     232                        0.19 23.0     209     Control            0    11.0     --     5-Fluorouracil     60   20.5     186     __________________________________________________________________________

Lymphocytic leukemia P388 test

The procedure used is the same as for the previously described test for lymphocytic leukemia P388 except that the test compounds are administered orally at various doses rather than intraperitoneally. The results of this test with typical compounds of the present invention appear in Table II. The criterion for efficacy is T/C×100≧125%.

                  TABLE II     ______________________________________     Lymphocytic Leukemia P388 Test (Oral Drug Administration)                               Median                        Dose   Survival                        mg./   Time     T/C × 100     Compound           kg.    (Days)   (Percent)     ______________________________________     Leuco-1,4-bis[(2-dimethylamino-                        50     16.0     160     ethyl)amino]-5,8-dihydroxy-anthra-                        25     13.5     135     quinone            12     12.5     125     Control             0     10.0     --     5-Fluorouracil*    60     19.0     190     1,4-Bis[(2-dimethylaminoethyl)-                        12     16.0     139     amino]-5,8-dihydroxy-anthraquinone                         6     16.0     139                         3     15.0     130     Control             0     11.5     --     5-Fluorouracil*    60     20.0     174     ______________________________________      *5-Fluorouracil administered intraperitoneally.

Melanotic Melanoma B16

The animals used are C57BC/6 mice, all of the same sex, weighing a minimum of 17 g. and all within a 3-g. weight range. There are normally 10 animals per test group. A one-gram portion of melanotic melanoma B16 tumor is homogenized in 10 ml. of cold balanced salt solution and a 0.5-ml. aliquot of the homogenate is implanted intraperitoneally into each of the test mice. The test compounds are administered intraperitoneally on days one through 9 (relative to tumor inoculation) at various doses. The animals are weighed and survivors are recorded on a regular basis for 60 days. The median survival time and the ratio of survival time for treated (T)/control (C) animals are calculated. The positive control compound is 5-fluorouracil given as a 20-mg./kg. injection. The results of this test with representative compounds of the present invention appear in Table III. The criterion for efficacy is T/C×100≧125%.

                  TABLE III     ______________________________________     Melanotic Melanoma B16 Test                                Median                        Dose    Survival T/C ×                        mg./    Time     100     Compound           kg.     (Days)   (Percent)     ______________________________________     Leuco-1,4-bis[(2-dimethylamino-                        25      25.0     151     ethyl)amino]-5,8-dihydroxy-anthra-                        12      23.0     139     quinone            6       21.5     130                        3       21.0     127     Control            0       16.5     --     5-Fluorouracil     20      25.0     151     1,4-Bis[(2-dimethylaminoethyl)-                        25      24.5     136     amino]-5,8-dihydroxy-anthraquinone                        12      28.5     158                        6       27.0     150                        3       25.5     142     Control            0       18.0     --     5-Fluorouracil     20      26.0     144     Leuco-1,4-bis[(2-diethylamino-                        50      23.0     139     ethyl)amino]-5,8-dihydroxy-anthra-     quinone     Control            0       16.5     --     5-Fluorouracil     20      25.0     151     1,4-Bis[(2-diethylaminoethyl)-                        50      20.5     125     amino]-5,8-dihydroxy-anthraquinone     Control            0       16.5     --     5-Fluorouracil     20      25.0     151     Leuco-1,4-bis[[2-(1-pyrrolidinyl)-                        50      23.0     144     ethyl]amino]-5,8-dihydroxy-anthra-                        25      22.0     137     quinone            12      21.0     131     Control            0       16.0     --     5-Fluorouracil     20      26.5     166     1,4-Bis[[2-(1-pyrrolidinyl)ethyl]-                        25      24.5     153     amino]-5,8-dihydroxy-anthraquinone                        12      22.0     137                        6       22.0     137     Control            0       16.0     --     5-Fluorouracil     20      26.5     166     1,4-Bis[(3-dimethylaminopropyl)-                        25      20.0     125     amino]-5,8-dihydroxy-anthraquinone     Control            0       16.0     --     5-Fluorouracil     20      26.5     166     Leuco-1,4-bis[(2-aminoethyl)-                        12      32.0     200     amino]-5,8-dihydroxy-anthraquinone     Control            0       16.0     --     5-Fluorouracil     20      26.5     166     Leuco-1,4-bis(3-aminopropylamino)-                        50      31.5     197     5,8-dihydroxy-anthraquinone                        25      27.0     169                        12      23.5     147                        6       22.5     141     Control            0       16.0     --     5-Fluorouracil     20      26.5     166     Leuco-1,4-bis[2-(2-methylamino-                        50      12.5      73     ethylamino]-5,8-dihydroxyanthra-                        25      35.0     206     quinone            12.5    39.5     232                        6.2     28.5     168     Control            0       17.0     --     5-Fluorouracil     20      30.0     176     Leuco-1,4-bis[2-(1-piperazinyl)                        50      34.5     203     ethylamino]-5,8-dihydroxyanthra-                        25      30.5     179     quinone            12.5    26.0     153                        6       22.0     129                        3       20.5     121     Control            0       17.0     --     5-Fluorouracil     20.0    30       176     1,4-Bis[2-(2-aminoethylamino)                        50      24.0     150     ethylamino]-5,8-dihydroxyanthra-                        25      22.5     141     quinone            12      22.0     138                        6       20.0     125     Control            0       16.0     --     5-Fluorouracil     20      27.0     169     Leuco-1,4-bis[2-dimethylamino-                        100     21.0     124     propylamino]-5,8-dihydroxyanthra-                        50      28.5     168     quinone            25      24.5     144                        12.5    20.5     121                        6       19.5     115     Control            0       17.0     --     5-Fluorouracil     20      30.0     176     1,4-Bis[2-(2-hydroxyethylamino)                        12      11.0      73     ethylamino]-5,8-dihydroxyanthra-                        6       15.0     100     quinone dihydrochloride                        3       >28.5    >190                        1.5     >34.0    >227                        0.7     >34.0    >227                        0.3     34.0     227     Control            0       15.0     --     5-Fluorouracil     60      23.0     153     Leuco-1,4-bis[2-(2-isopropylamino)                        50      6.5       39     ethylamino] -5,8-dihydroxyanthra-                        25      31.0     188     quinone            12      30.0     182                        6       25.0     151     Control            0       16.5     --     5-Fluorouracil     20      16.5     100     1,4-Bis[2-(methylamino)ethyl-                        12.5    11.5      59     amino]-5,8-dihydroxyanthra-                        6.2     26.5     136     quinone dihydrochloride                        3.1     49.0     251                        1.5     33.0     169                        0.78    35.0     179                        0.39    25.0     128                        0.19    29.5     151     Control            0       19.5     --     5-Fluorouracil     60      25.0     128     Leuco-1,4-bis(4-aminobutyl-                        100     21.0     124     amino)-5,8-dihydroxyanthra-                        50      20.0     118     quinone            25      18.5     109                        12      16.0      94     Control            0       17.0     --     5-Fluorouracil     20      30.0     176     Leuco-1,4-bis[2-(2-hydroxy-                        6       9.5       59     ethylamino(ethylamino]-5,8-                        3       20.5     128     dihydroxyanthraquinone                        1.5     30.0     187                        0.75    28.5     178                        0.37    22.0     137     Control            0       16.0     --     5-Fluorouracil     20      27.5     172     Leuco-1,4-bis[2-(methylamino)                        12      28.0     175     ethylamino]-5,8-dihydroxyanthra-                        6       32.5     203     quinone            3       31.0     194                        1.5     36.0     225                        0.7     27.5     172     Control            0       16.0     --     5-Fluorouracil     20      27.5     172     ______________________________________

Ridgway Osteogenic Sarcoma

The animals used are AKD₂ F₁ /J mice, all of the same sex, weighing a minimim of 17 g. and all within a three-gram weight range. There are normally 8 animals per test group. The tumor is administered subcutaneously by trocar as five 2-mm. fragments per mouse. The test compounds are administered intraperitoneally every 4 days for a total of 6 inoculations beginning on day 15 (relative to tumor inoculation) at various doses. The animals are weighed and survivors are recorded on a regular basis for 90 days. The regression of tumors is recorded in all test animals. Table IV gives the result of this test with a representative compound of this invention in terms of the percentage of animals showing tumor regression.

                                      TABLE IV     __________________________________________________________________________     Ridgway Osteogenic Sarcoma                                                         63 Days After                   1 Day Before                              7 Days After Therapy Stopped                                                         Therapy Stopped                   Therapy    No. Without         % Showing                                                         Median              Dose No. Mice                         Tumor                              Tumors/No.                                     Tumor                                          % Inhibition                                                  50% Tumor                                                         Survival                                                               T/C     Compound (mg./kg.)                   Per Group                         (mm.) 2                              Survivors                                     (mm.) 2                                          Tumor Growth                                                  Regression                                                         (Days)                                                               (Percent)     __________________________________________________________________________     Placebo  --   8     64   0/5    1189         0      44.5     1,4-Bis[(2-di-              100  7     77   2/5     52  96      28     48    108     methylamino-              50   8     68   2/6    263  78      25     92.5  208     ethyl)amino]              25   8     82   0/8    653  41      0      78    175     5,8-dihydroxy-              12   7     84   0/3    470  61      0      37     83     anthraquinone              6    7     83   0/6    960  19      0      57.5  129     Methotrexate              25   8     51   1/6    546  54      12     52.5  118              12   8     52   0/5    916  23      0      49    110              6    8     54   0/4    758  36      0      46    103     Vincristine              1.5  8     42   4/4     0   100     100    68    153              1.0  6     99   6/6     0   100     100    85    191              0.5  7     94   4/7     77  93      57     83    186     __________________________________________________________________________

A preferred embodiment of the present invention may be represented by the following general formula: ##STR7## wherein Q is as hereinbefore defined; R₁ is hydrogen, alkyl having from 1 to 4 carbon atoms or monohydroxyalkyl having from 2 to 4 carbon atoms and wherein the carbon atom alpha to the nitrogen atom may not bear an hydroxy group; R₂ is monohydroxyalkyl having from 2 to 4 carbon atoms and wherein the carbon atom alpha to the nitrogen atom may not bear an hydroxy group, dihydroxyalkyl having from 3 to 6 carbon atoms and wherein the carbon atom alpha to the nitrogen atom may not bear an hydroxy group or a moiety of the formula: ##STR8## wherein n, R₃ and R₄ are as hereinbefore defined; with the proviso that the ratio of the total number of carbon atoms to the sum of the total number of oxygen atoms plus the total number of nitrogen atoms in each of the side chains at the 1-position and the 4-position may not exceed four. The preferred embodiment includes the corresponding leuco bases of the aromatic bases (I), the tautomers thereof, and the non-toxic pharmaceutically acceptable acid-addition salts thereof.

Another preferred embodiment of the present invention may be represented by the following general formula: ##STR9## wherein n is an integer from 2 to 4, inclusive, and R₁ and R₂ are as defined for the preceding preferred embodiment with the proviso that the ratio of the total number of carbon atoms to the sum of total number of oxygen atoms plus the total number of nitrogen atoms in each of the side chains at the 1-position and the 4-position may not exceed four. This preferred embodiment also includes the corresponding leuco bases of the aromatic bases (V), the tautomers thereof, and the non-toxic pharmaceutically acceptable acid-addition salts thereof.

Also embraced within the purview of the present invention are therapeutic compositions of matter useful for ameliorating cancer diseases in mammals and containing certain 5,8-dihydroxy-1,4-bis(substituted-amino)anthraquinones (or the leuco bases and non-toxic acid-addition salts thereof) which may be represented by the following structural formula: ##STR10## wherein R₁ is hydrogen or alkyl having from 1 to 4 carbon atoms, R₂ is hydrogen or alkyl having from 1 to 4 carbon atoms, R₁ and R₂ taken together with their associated N(itrogen) is as hereinbefore defined for R₃ and R₄ taken together with their associated N(itrogen), and Q is as hereinbefore defined. This aspect of the invention includes the novel compositions of matter and the method of inducing the regression and/or palliation of leukemia and related cancers in mammals therewith.

The active ingredients of the therapeutic compositions and the novel compounds of the present invention inhibit transplanted mouse tumor growth and induce regression and/or palliation of leukemia and related cancers in mammals when administered in amounts ranging from about 5 mg. to about 200 mg. per kilogram of body weight per day. A preferred dosage regimen for optimum results would be from about 5 mg. to about 50 mg. per kilogram of body weight per day, and such dosage units are employed that a total of from about 350 mg. to about 3.5 grams of the active compound for a subject of about 70 kg. of body weight are administered in a 24-hour period. This dosage regimen may be adjusted to provide the optimum therapeutic response. For example, several divided doses may be administered daily or the dose may be proportionally reduced as indicated by the exigencies of the therapeutic situation. A decided practical advantage is that the active compound may be administered in any convenient manner such as by the oral, intravenous, intramuscular, or subcutaneous routes.

The active compounds may be orally administered, for example, with an inert diluent or with an assimilable edible carrier, or they may be enclosed in hard or soft shell gelatin capsules, or they may be compressed into tablets, or they may be incorporated directly with the food of the diet. For oral therapeutic administration, the active compounds may be incorporated with excipients and used in the form of ingestible tablets, buccal tablets, troches, capsules, elixirs, suspensions, syrups, wafers, and the like. Such compositions and preparations should contain at least 0.1% of active compound. The percentage of the compositions and preparations may, of course, be varied and may conveniently be between about 2 to about 60% of the weight of the unit. The amount of active compound in such therapeutically useful compositions is such that a suitable dosage will be obtained. Preferred compositions or preparations according to the present invention are prepared so that an oral dosage unit form contains between about 5 and 200 milligrams of active compound.

The tablets, troches, pills, capsules and the like may also contain the following: A binder such as gum tragacanth, acacia, corn starch or gelatin; excipients such as dicalcium phosphate; a disintegrating agent such as corn starch, potato starch, alginic acid and the like; a lubricant such as magnesium stearate; and a sweetening agent such as sucrose, lactose or saccharin may be added or a flavoring agent such as peppermint, oil of wintergreen, or cherry flavoring. When the dosage unit form is a capsule, it may contain, in addition to materials of the above type, a liquid carrier. Various other materials may be present as coatings or to otherwise modify the physical form of the dosage unit. For instance, tablets, pills, or capsules may be coated with shellac, sugar or both. A syrup or elixir may contain the active compound, sucrose as a sweetening agent, methyl and propylparabens as preservatives, a dye and flavoring such as cherry or orange flavor. Of course, any material used in preparing any dosage unit form should be pharmaceutically pure and substantially non-toxic in the amounts employed. In addition, the active compounds may be incorporated into sustained-release preparations and formulations.

The active compounds may also be administered parenterally or intraperitoneally. Solutions of the active compound as a free base or pharmacologically acceptable salt can be prepared in water suitably mixed with a surfactant such as hydroxypropylcellulose. Dispersions can also be prepared in glycerol, liquid polyethylene glycols, and mixtures thereof and in oils. Under ordinary conditions of storage and use, these preparations contain a preservative to prevent the growth of microorganisms.

The pharmaceutical forms suitable for injectable use include sterile aqueous solutions or dispersions and sterile powders for the extemporanous preparation of sterile injectable solutions or dispersions. In all cases the form must be sterile and must be fluid to the extent that easy syringability exists. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms such as bacteria and fungi. The carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), suitable mixtures thereof, and vegetable oils. The proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants. The prevention of the action of microorganisms can be brought about by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, sorbic acid, thimerosal, and the like. In many cases, it will be preferable to include isotonic agents, for example, sugars or sodium chloride. Prolonged absorption of the injectable compositions can be brought about by the use in the compositions of agents delaying absorption, for example. aluminum monostearate and gelatin.

Sterile injectable solutions are prepared by incorporating the active compound in the required amount in the appropriate solvent with various of the other ingredients enumerated above, as required, followed by filtered sterilization. Generally, dispersions are prepared by incorporating the various sterilized ingredient into a sterile vehicle which contains the basic dispersion medium and the required other ingredients from those enumerated above. In the case of sterile powders for the preparation of sterile injectable solutions, the preferred methods of preparation are vacuum drying and the freeze-drying technique which yield a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.

As used herein, "pharmaceutically acceptable carrier" includes any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents and the like. The use of such media and agents for pharmaceutical active substances is well known in the art. Except insofar as any conventional media or agent is in compatable with the active ingredient, its use in the therapeutic compositions is contemplated. Supplementary active ingredients can also be incorporated into the compositions.

It is especially advantageous to formulate parenteral compositions in dosage unit form for ease of administration and uniformity of dosage. Dosage unit form as used herein refers to physically discrete units suited as unitary dosages for the mammalian subjects to be treated; each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier. The specification for the novel dosage unit forms of the invention are dictated by and directly dependent on (a) the unique characteristics of the active material and the particular therapeutic effect to be achieved, and (b) the limitations inherent in the art of compounding such an active material for the treatment of disease in living subjects having a diseased condition in which bodily health is impaired as herein disclosed in detail.

The principal active ingredient is compounded for convenient and effective administration in effective amounts with a suitable pharmaceutically-acceptable carrier in dosage unit form as hereinbefore disclosed. A unit dosage form can, for example, contain the principal active compound in amounts ranging from about 0.1 to about 400 mg., with from about one to about 30 mg. being preferred. Expressed in proportions, the active compound is generally present in from about 0.1 to about 400 mg./ml. of carrier. In the case of compositions containing supplementary active ingredients, the dosages are determined by reference to the usual dose and manner of administration of the said ingredients.

Regression and palliation of cancers are attained, for example, using intraperitoneal administration. A single intravenous dosage or repeated daily dosages can be administered. Daily dosages up to about 5 or 10 days are often sufficient. It is also possible to dispense one daily dosage or one dose on alternate or less frequent days. As can be seen from the dosage regimens, the amount of principal active ingredient administered is a sufficient amount to aid regression and palliation of the leukemia or the like, in the absence of excessive deleterious side effects of a cytotoxic nature to the hosts harboring the cancer. As used herein, cancer disease means blood malignancies such as leukemia, as well as other solid and non-solid malignancies such as the melanocarcinomas, lung carcinomas, and mammary tumors. By regression and palliation is meant arresting or retarding the growth of the tumor or other manifestation of the disease compared to the course of the disease in the absence of treatment.

This invention will be described in greater detail in conjunction with the following specific examples.

EXAMPLE 1 Leuco-1,4-bis[(2-dimethylaminoethyl)amino]-5,8-dihydroxy-anthraquinone

A reaction mixture comprising 10.58 g. of N,N-dimethylethylenediamine, 60 ml. of N,N,N',N'-tetramethylethylenediamine and 10.96 g. of leuco-1,4,5,8-tetrahydroxyanthraquinone is flushed with nitrogen and stirred under nitrogen for 2 hours while heating with an oil bath kept at 49°-51° C. The mixture is allowed to cool under nitrogen. The solid is collected and washed with ethanol giving 14.78 g. of the desired product as a dark red-brown solid.

EXAMPLE 2 1,4-Bis[(2-dimethylaminoethyl)amino]-5,8-dihydroxyanthraquinone

A 12.00-g. portion of leuco-1,4-bis[(2-dimethylaminethyl)amino-5,8-dihydroxy-anthraquinone in 100 ml. of nitrobenzene is heated under reflux for 15 minutes and then filtered while hot. The filtrate is reheated to boiling, allowed to cool, and the solid is collected and washed with ethanol giving 8.44 g. of the desired product as blue-black crystals, mp. 236°-238° C.

EXAMPLE 3 Leuco-1,4-bis(2-morpholinoethylamino)-5,8-dihydroxyanthraquinone

A solution of 15.62 g. of N-(2-aminoethyl)morpholine in 40 ml. of N,N,N',N'-tetramethylethylenediamine is de-aerated by bubbling nitrogen through it for 15 minutes. A 10.97-g. portion of leuco-1,4,5,8-tetrahydroxyanthraquinone is added slowly with stirring and the suspension is treated as described in Example 1, giving 18.07 g. of the desired product as an olive solid, mpm 223°-227° C.

EXAMPLE 4 1,4-Bis(2-morpholinoethylamino)-5,8-dihydroxyanthraquinone

A 13.90-g. portion of leuco-1,4-bis(2-morpholinoethylamino)-5,8-dihydroxy-anthraquinone in 100 ml. of nitrobenzene is oxidized as described in Example 2 giving 10.30 g. of the desired product as black rods, mp. 241°-243° C.

EXAMPLE 5 Leuco-1,4-bis[(2-diethylaminoethyl)amino]-5,8-dihydroxyanthraquinone

The procedure of Example 3 is repeated using 13.95 g. of N,N-diethylethylenediamine in place of the N-(2-aminoethyl)morpholine, giving 13.97 g. of the desired product as a red-brown solid, mp. 182°-185° C.

EXAMPLE 6 1,4-Bis[(2-diethylaminoethyl)amino]-5,8-dihydroxyanthraquinone

A 10.90-g. portion of leuco-1,4-bis[(2-diethylaminoethyl)amino]-5,8-dihydroxyanthraquinone is oxidized as described in Example 2 giving 6.35 g. of the desired product as blue-black needles, mp. 202°-204° C.

EXAMPLE 7 Leuco-1,4-bis[2-(1-pyrrolidinyl)ethylamino]-5,8-dihydroxyanthraquinone

The procedure of Example 3 is repeated using 12.05 g. of N-2-pyrrolidinoethylamine, in place of the N-(2-aminoethyl)morpholine, and 80 ml. of N,N,N',N'-tetramethylethylenediamine, giving 13.24 g. of the desired product as a red-brown solid, mp. 180°-185° C.

EXAMPLE 8 1,4-Bis[2-(1-pyrrolidinyl)ethylamino]-5,8-dihydroxyanthraquinone

An 8.61-g. portion of leuco-1,4-bis[[2-(1-pyrrolidinyl)ethyl]amino]-5,8-dihydroxyanthraquinone is oxidized as described in Example 2. The reaction mixture is evaporated to dryness and the residue recrystallized from toluene, giving 5.12 g. of the desired product as blue-black crystals, mp. 193°-196° C.

EXAMPLE 9 Leuco-1,4-bis[2-(methylamino)ethylamino]-5,8-dihydroxyanthraquinone

The procedure of Example 7 is repeated using 8.90 g. of N-methylethylenediamine in place of the N-2-pyrrolidinoethylamine, giving 13.73-g. of the desired product as a dark green solid, mp. 157°-160° C.

EXAMPLE 10 Leuco-1,4-bis[(3-dimethylaminopropyl)amino]-5,8-dihydroxyanthraquinone

Nitrogen is bubbled through an 80-ml. portion of dimethylaminopropylamine for 15 minutes. A 10.97-g. portion of leuco-1,4,5,8-tetrahydroanthraquinone is added slowly with stirring. The mixture is heated under nitrogen at 50°-52° C. for 2 hours and then allowed to cool. The solid is collected and washed with cold ethanol giving 5.59-g. of dark, orange-red crystals, mp. 115°-118° C.

EXAMPLE 11 1,4-Bis[(3-dimethylaminopropyl)amino]-5,8-dihydroxyanthraquinone

A suspension of 6.00-g. of leuco-1,4-bis[(3-dimethylaminopropyl)amino]-5,8-dihydroxyanthraquinone in 60 ml. of N,N,N',N'-tetramethylethylenediamine is heated on a steam bath under reflux while air is bubbled in for 12 hours. The solution is cooled, producing a solid which is collected and washed twice with heptane and once with petroleum ether. This solid is recrystallized by extracting with 350 ml. of hot heptane, filtering and concentrating to 300 ml. Crystallization and washing with petroleum ether gives 3.72 g. of the desired product as black needles, mp. 154°-157° C.

EXAMPLE 12 Leuco-1,4-bis(2-aminoethylamino)-5,8-dihydroxyanthraquinone

A reaction mixture comprising 10.97-g. of leuco-1,4,5,8-tetrahydroxyanthraquinone in 80 ml. of de-aerated N,N,N',N'-tetramethylethylenediamine containing 7.22 g. of ethylenediamine is heated and stirred under nitrogen at 48°-50° C. for one hour. The mixture is allowed to stand under a slow flow of nitrogen, producing a solid which is collected and washed with ethyl acetate, acetonitrile and petroleum ether giving 13.8 g. of the desired product as a red-black solid.

EXAMPLE 13 Leuco-1,4-bis(3-aminopropylamino)-5,8-dihydroxyanthraquinone

A suspension of 10.97 g. of leuco-1,4,5,8-tetrahydroxyanthraquinone in a de-aerated solution of 8.90 g. of 1,3-diaminopropane in 80 ml. of N,N,N',N'-tetramethylethylenediamine is stirred and heated at 49° C. for one hour under nitrogen, then allowed to cool. The resulting solid is collected and washed with cold ethanol giving 14.21 g. of the desired product as a black solid.

EXAMPLE 14 Leuco-1,4-bis[2-(2-hydroxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone

A suspension of 12.5 g. of 2-(2-aminoethylamino)ethanol in 40 ml. of N,N,N',N'-tetramethylethylenediamine is stirred and de-aerated by bubbling nitrogen in for 15 minutes. A 10.97-g. portion of leuco-1,4,5,8-tetrahydroxyanthraquinone is gradually added with stirring. The suspension is heated and stirred under nitrogen in an oil bath at 50°-52° C. for 5 hours. The mixture is allowed to stand and cool under nitrogen for 12 hours. The solid is collected by decantation, macerated in ethanol, collected and washed with ethanol giving 15.06 g. of the desired product as a green-gray solid, mp. 129°-131° C.

EXAMPLE 15 Leuco-1,4-bis[2-[di(β-hydroxyethyl)amino]ethylamino]-5,8-dihydroxyanthraquinone

A solution of 17.8 g. of N,N-di(2-hydroxyethyl)ethylenediamine in 100 ml. of methanol is cooled with an ice bath, stirred, and de-aerated by bubbling in nitrogen for 15 minutes. A 10.97-gram portion of leuco-1,4,5,8-tetrahydroxyanthraquinone is gradually added with stirring and continued cooling. The suspension is heated and stirred under nitrogen in an oil bath at 50°-52° C. for one hour and the mixture is then allowed to stand and cool under nitrogen overnight. The solid is collected and washed with ethanol giving 14.8 g. of a red-brown solid, m.p. 165°-168° C.

EXAMPLE 16 1,4-Bis[2-(methylamino)ethylamino]-5,8-dihydroxyanthraquinone dihydrochloride

To a suspension of 11.60 g. (0.03 mole) of leuco-1,4-bis[2-(methylamino)ethylamino]-5,8-dihydroxyanthraquinone in 200 ml. of 2-methoxyethanol was added gradually with stirring 15 ml. of 8N ethanolic hydrogen chloride. The system was chilled with an ice bath and stirred as 7.50 g. (0.0305 mole) of chloranil powder was gradually added. The mixture was stirred overnight at room temperature and diluted with 600 ml. of ether. The solid was collected and washed with tetrahydrofuran. The product (14.16 g.) was recrystallized by dissolving it in 130 ml. of water and adding 650 ml. of acetone to give 13.15 g. of a blue-black solid.

EXAMPLE 17 1,4-Bis[2-(2-aminoethylamino)ethylamino]-5,8-dihydroxyanthraquinone

Following the general procedure of Example 3, a mixture of 10.97-g. of leuco-1,4,5,8-tetrahydroxyanthraquinone, 80 ml. of N,N,N',N'-tetramethylethylenediamine and 21.84-g. (0.24 mole) of diethylenetriamine soon gave a thick, congealed mass which prevented effective stirring so the reaction time was extended to 24 hours. The mixture was allowed to cool and the supernatent liquid was decanted and discarded. A solution of the congealed mass in 100 ml. of methanol was filtered, then allowed to oxidize in the air for four days in a partially covered flask. The gelatinous mass which had separated became solid when the oxidation mixture was agitated with 200 ml. of acetonitrile and then allowed to stand for one hour. After the solid was collected and washed first with acetonitrile, then with ether, it amounted to 10.88 g. of a blue-black powder.

EXAMPLE 18 Leuco-1,4-bis(4-aminobutylamino)-5,8-dihydroxyanthraquinone

Following the general procedure of Example 3 but using 45 ml. of 1,4-diaminobutane as the primary amine component, there was obtained 12.20 g. of product as a dull grey-green solid.

EXAMPLE 19 Leuco-1,4-bis[2-dimethylaminopropylamino]-5,8-dihydroxyanthraquinone

The reaction of 12.26 g. of 2-dimethylaminopropylamine with 10.97 g. of leuco-1,4,5,8-tetrahydroxyanthraquinone in 100 ml. of ethanol for one hour by the procedure of Example 1 gives 7.29 g. of red-brown crystals.

EXAMPLE 20 Leuco-1,4-bis[2-(2-methylaminoethylamino)ethylamino]-5,8-dihydroxyanthraquinone

To a solution of 14.10 g. of 1-methyl diethylenetriamine in 50 ml. of ethanol and 40 ml. of N,N,N',N'-tetramethylethylenediamine is added 10.97 g. of leuco-1,4,5,8-tetrahydroxyanthraquinone as in Example 1. The mixture is heated at 50° and stirred under nitrogen for one hour, chilled with an ice bath, the solid collected and washed with cold ethanol to give 7.23 g. of green-black crystals, m.p. 108°-111° C.

EXAMPLE 21 Leuco-1,4-bis[2-(2-dimethylaminoethylamino)ethylamino]-5,8-dihydroxyanthraquinone

The reaction of N-(dimethylaminoethyl)ethylenediamine with leuco-1,4,5,8-tetrahydroxyanthraquinone by the procedure of Example 20 gives the title compound.

EXAMPLE 22 Leuco-1,4-bis[2-(1-piperazinyl)ethylamino]-5,8-dihydroxyanthraquinone

The procedure of Example 20 applied to 15.50 g. of N-(2-aminoethyl)piperazine gives 3.92 g. of a black powder which does not melt by 350° C. and is discarded. The mother liquor and ethanol washes, on standing and partly evaporating during two weeks in an unstoppered flask, deposit a solid which is collected and washed with ethanol to give 6.19 g. of the title compound as a black solid, m.p. 200°-203° C.

EXAMPLE 23 1,4-Bis(2-aminoethylamino)-5,8-dihydroxyanthraquinone dihydrochloride

Oxidation with chloranil of 28.25 g. of the product of Example 12 by the procedure of Example 16 gives 29.66 g. of a crude, blue-black solid which is then extracted by stirring for 14 hours with 800 ml. of water. Solids are removed by centrifugation and the supernatent solution freeze-dried, leaving 16.38 g. of a blue-black solid which is unmelted by 350° C.

EXAMPLE 24 1,4-Bis[2-(2-hydroxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone Dihydrochloride

Chloranil oxidation of 17.86 g. of the product of Example 14 by the procedure of Example 16 gives (without recrystallization) 21.34 g. of blue-black solid, m.p. 203°-205° C.

EXAMPLE 25 1,4-Bis[2-(2-methylaminoethylamino)ethylamino]-5,8-dihydroxyanthraquinone Tetrahydrochloride

The product of Example 20 (11.70 g.) is oxidized with chloranil by the procedure of Example 16, giving 18.03 g. of blue-black solid, m.p. 190°-203° C.

EXAMPLE 26 1,4-Bis[2-(2-hydroxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone

In a modification of the synthesis of Example 14 the solvent used is 100 ml. of ethanol. The mother liquor from the leuco product is allowed to stand for two weeks in an unstoppered flask, whereupon the oxidized product separates. It is collected and washed with ethanol, then recrystallized from ethanol, giving blue-black crystals, m.p. 175°-177° C.

EXAMPLE 27 Leuco-1,4-bis[3-(2-hydroxyethylamino)-1-propylamino]-5,8-dihydroxyanthraquinone

The procedure of Example 15 is used with a solution of 14.18 g. of 2-(3-aminopropylamino)ethanol in 100 ml. of ethanol. The resulting solution is filtered and the filtrate diluted with 300 ml. of ether, precipitating the product as a goo. After decantation of the supernatent solution the goo is caused to crystallize by agitating it with 100 ml. of tetrahydrofuran. Washing with ethanol gives 12.56 g. of green-black solid, m.p. 101°-104° C.

EXAMPLE 28 1,4-Bis[3-(2-hydroxyethylamino)-1-propylamino]-5,8-dihydroxyanthraquinone dihydrochloride

Oxidation of 9.95 g. of leuco-1,4-bis[3-(2-hydroxyethylamino)propylamino]-5,8-dihydroxyanthraquinone with chloranil as in Example 16 gives 11.70 g. of a blue solid which does not melt by 350° C.

EXAMPLE 29 Leuco-1,4-bis[2-(3-hydroxy-1-propylamino)ethylamino]-5,8-dihydroxyanthraquinone

The procedure of Example 15 is paralleled with 14.18 g. of N-(3-hydroxypropyl)ethylenediamine in 100 ml. of ethanol to give 14.63 g. of red-brown crystals, m.p. 58°-60° C.

EXAMPLE 30 1,4-Bis[2-(3-hydroxy-1-propylamino)ethylamino]-5,8-dihydroxyanthraquinone dihydrochloride

Chloranil oxidation of 10.77 g. of the product of Example 29 by the procedure of Example 16 yielded 11.64 g. of a dark blue solid, m.p. 210°-216° C.

EXAMPLE 31 Leuco-1,4-bis[2-(2-hydroxy-1-propylamino)ethylamino]-5,8-dihydroxyanthraquinone

With 14.18 g. of 1-(2-aminoethylamino)-2-propanol in 100 ml. of ethanol the procedure of Example 15 yields 17.61 g. of green-black crystals, m.p. 50°-60° C.

EXAMPLE 32 1,4-Bis[2-(2-hydroxy-1-propylamino)ethylamino]-5,8-dihydroxyanthraquinone dihydrochloride

A filtered solution of 14.44 g. of leuco-1,4-bis[2-(2-hydroxy-1-propylamino)ethylamino]-1,4-dihydroxyanthraquinone in 215 ml. of 2-methoxyethanol is oxidized with 7.65 g. of chloranil by the procedure of Example 16, affording 16.75 g. of purple solid, m.p. 177°-185° C.

EXAMPLE 33 Leuco-1,4-bis[2-[2-(2-hydroxyethylamino)ethylamino]ethylamino]-5,8-dihydroxyanthraquinone

The procedure of example 15 used with a solution of 17.67 g. of 2-[2-(2-aminoethylamino)ethylamino]ethanol in 100 ml. of methanol gives a solution which is filtered, then diluted with 300 ml. of ether, precipitating a goo which hardens on standing overnight. Hardening is completed by thorough maceration of the solid in the solvent. The solid is collected and washed with ether, yielding 16.82 g. of a green-black solid. This solid remains granular if stored at -25° C., but coalesces into a solid cake is stored at 25° C.

EXAMPLE 34 1,4-Bis[2-[2-(2-hydroxyethylamino)ethylamino]ethylamino]-5,8-dihydroxyanthraquinone tetrahydrochloride

Chloranil oxidation of 12.10 g. of the product of Example 33 by the method of Example 16, including three additional washings of the solid with methanol, gives 12.46 g. of dark blue, solid product.

EXAMPLE 35 1,4-Bis[2-(2,3-dihydroxypropylamino)ethylamino]-5,8-dihydroxyanthraquinone dihydrochloride

By the procedure of Example 15 a solution of 16.10 g. of 3-(2-aminoethylamino)-1,2-propanediol [A. R. Surrey, C. M. Suter and J. S. Buck, J. Am. Chem. Soc., 74, 4102(1952)]in 100 ml. of methanol gives a goo which is separated from solvent by chilling with an ice bath, then decanting. The goo is washed four times by stirring 1.5 hours at 25° with 100-ml. portions of methanol, chilling with an ice bath, then decanting. A filtered solution of the goo in 280 ml. of 2-methoxyethanol is oxidized with 10.01 g. of chloranil by the method of Example 16. The product is additionally washed with ethanol, giving 15.25 g. of a blue-black solid, m.p. 191°-193° C.

EXAMPLE 36 Leuco-1,4-bis[2-(1-aziridino)ethylamino]-5,8-dihydroxyanthraquinone

With 10.33 g. of N-(2-aminoethyl)aziridine in 80 ml. of N,N,N',N'-tetramethylethylenediamine the procedure of Example 15 gives a stiff gum. The next day the supernatent solution is discarded, 100 ml. of ether is added and the gum periodically macerated therein for another day, when the gum is mostly hardened. Hardening is completed by maceration during three washings of the solid with ether, giving 17.66 g. of blue-black, granular powder.

EXAMPLE 37 1,4-Bis[2-(1-aziridino)ethylamino]-5,8-dihydroxyanthraquinone

To a suspension of 4.10 g. of the product of Example 36 in 40 ml. of chlorodorm is added a solution of 1.74 g. of diethyl azodicarboxylate in 25 ml. of chloroform. The mixture is stirred for 20 minutes, the resulting dark blue solution is filtered, and the filtrate is evaporated at ≦30°. A solution of the residue in 40 ml. of chloroform is stirred five minutes with 2 g. of decolorizing carbon, filtered and washed through with another 25 ml. of chloroform. Addition of 100 ml. of ether to the filtrates precipitates a gum which is eliminated by decantation-filtration. The filtrates deposit crystals which are washed sparingly with acetone. The chloroform-ether mother liquor, chilled at -60° C., deposits a second crop of crystals which is washed with ether and with methanol. A solution of both crops of crystals in 20 ml. of chloroform is stirred with decolorizing carbon, filtered, evaporated at ≦25° C. to a volume of 5 ml., diluted with 20 ml. of ether, then chilled at -60° C. The resulting blue-black crystals, washed with ether, amount to 0.64 g., m.p. 168°-170 ° C. In thin-layer chromatography on silica gel the product is moved as a blue spot by chloroform-triethylamine-methanol, 27/3/1 (ratios by volume).

EXAMPLE 38 1,4-Bis[2-[2-(1-morpholino)ethylamino]ethylamino]-5,8-dihydroxyanthraquinone tetrahydrochloride

A solution of 20.80 g. of N-(morpholinoethyl)ethylenediamine in 100 ml. of ethanol is used in the procedure of Example 15 to give a solution which is filtered and diluted with 900 ml. of ether, precipitating a goo. The supernatent solution is decanted, the goo dissolved in 175 ml. of 2-methoxyethanol and oxidized with 5.29 g. of chloranil by the method of Example 16, giving 17.7 g. of dark blue solid.

EXAMPLE 39 Leuco-1,4-Bis[2-(acetamido)ethylamino]-5,8-dihydroxyanthraquinone

A solution of 12.26 g. of N-acetylethylene diamine in 100 ml. of ethanol in the procedure of Example 15 gives 15.27 g. of dark, red-brown solid, m.p. 125° C.

EXAMPLE 40 1,4-Bis[2-(acetamido)ethylamino]-5,8-dihydroxyanthraquinone

A suspension of 11.95 g. of leuco-1,4-bis[2-(acetamido)ethylamino]-5,8-dihydroxyanthraquinone is oxidized with 6.76 g. of chloranil during 61 hours by the method of Example 16, giving a very acidic hydrochloride salt which is vonverted to the free base by four washings with water. Crystallization from 110 ml. of dimethyl sulfoxide (boiling only 2 minutes and not attempting a hot filtration), then washing with dimethyl sulfoxide and with ethanol gives 7.76 g. of blue-black solid, m.p. 273°-274° C.

EXAMPLE 41 1,4-Bis[2-[N-(2-hydroxyethyl)triflouroacetamido]ethylamino]-5,8-dihydroxyanthraquinone

A suspension of 1.50 g. of 1,4-bis[2-(2-hydroxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone in 75 ml. of ethyl triflouroacetate and 75 ml. of methanol is stirred for 10 minutes. Evaporation of the resulting solution in vacuo at 30° C. leaves a residue which is washed and macerated with methylene chloride, giving 2.11 g. of blue-black solid, m.p. 162° C.

EXAMPLE 42 1,4-Bis[2-amino-2-carboxyethylamino]-5,8-dihydroxyanthraquinone .3/4 HCl

To a solution of 6.23 g. of dl-α,β-diaminopropionic acid in 30 ml. of warm water is added 1.078 g. of lithium hydroxide and 60 ml. of dimethyl sulfoxide. The system is flushed with nitrogen and 4.12 g. of leuco-1,4,5,8-tetrahydroxyanthraquinone is added gradually with stirring. The mixture is stirred and heated with an oil bath at 50°, first for 15 hours under nitrogen, then for 21 hours as the initial product is oxidized by bubbling in a stream of air. Thin-layer chromatography on silica gel with methanol-water-concentrated ammonia (25/5/1 by volume) shows all the product spots to be blue when the oxidation is complete. After the mixture is cool the solids are removed by filtration and washed once with dimethyl sulfoxide-water (2/1). Addition of 400 ml. of methanol to the filtrates precipitates a solid which is collected and washed with methanol. Further washing with a total of 13. ml. of 0.01N aqueous acetic acid dissolves virtually all of the solid. Addition of 3 ml. of concentrated hydrochloric acid to the acetic acid filtrates precipitates a blue-black solid which is washed with acetone to give 0.24 g. of the product.

EXAMPLE 43 Leuco-1,4-bis[2-(2-methoxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone

An ethanol solution of N-(2-methoxyethyl)ethylendiamine (U.S. Pat. No. 3,454,640) reacts in the procedure of Example 15 to give the title compound.

EXAMPLE 44 1,4-Bis[2-(1,3-oxazolidin-1-yl)ethylamino]-5,8-dihydroxyanthraquinone

A solution of 1.62 g. of 37% aqueous formaldehyde solution in 50 ml. of water is stirred overnight with 4.44 g. of 1,4-bis[2-(2-hydroxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone. The resulting solid is washed with water to give the product.

EXAMPLE 45 1,4-Bis[2-(tetrahydro-1,3-oxazin-1-yl)ethylamino]-5,8-dihydroxyanthraquinon

A solution of 1.62 ml. of 37% aqueous formaldehyde in 50 ml. of 0.4N aqueous sodium hydroxide is stirred overnight with 5.45 g. of 1,4-bis[2-(3-hydroxy-1-propylamino)ethylamino]-5,8-dihydroxyanthraquinone dihydrochloride. The product is obtained by washing the resulting solid with water.

EXAMPLE 46 1,4-Bis[2-(1,3-oxazolidin-2-one-1-yl)ethylamino]-5,8-dihydroxyanthraquinone

A solution of 0.020 g. of sodium in 25 ml. of methanol is stirred and heated under reflux overnight with 75 ml. of diethyl carbonate and 4.44 g. of 1,4-bis[2-(2-hydroxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone. The mixture is allowed to cool. It is stirred with 0.1 ml. of acetic acid, the solid is collected by filtration and washed with methanol to give the product.

EXAMPLE 47 1,4-Bis[2-(1,3-oxazin-2-one-1-yl)ethylamino]-5,8-dihydroxyanthraquinone

A solution of 0.48 g. of sodium in 25 ml. of methanol is stirred and heated overnight with 75 ml. of diethyl carbonate and 5.45 g. of 1,4-bis[2-(3-hydroxy-1-propylamino)ethylamino]-5,8-dihydroxyanthraquinone dihydrochloride. After the mixture cools it is stirred with 0.1 ml. of acetic acid. The solid product is collected by filtration and washed with methanol and then with water.

EXAMPLE 48 1,4-Bis[2-[di(β-hydroxyethyl)amino]ethylamino]-5,8-dihydroxyanthraquinone dihydrochloride

Chloranil oxidation of 10.77 g. of the product of Example 15 by the method of Example 16 gives 11.64 g. of a dark blue solid, m.p. 216° C.

EXAMPLE 49

    ______________________________________     Preparation of 50 mg. Tablets     Per Tablet                 Per 10,000 Tablets     ______________________________________     0.050          gm.     1,4- --bis(3-aminopropylamino)-                                      500  gm.                  5,8-dihydroxyanthraquinone     0.080          gm.     Lactose             800  gm.     0.010          gm.     Corn Starch (for mix)                                      100  gm.     0.008          gm.     Corn Starch (for paste)                                      75   gm.     0.148          gm.                         1475 gm.     0.002          gm.     Magnesium Stearate (1%)                                      15   gm.     0.150          gm.                         1490 gm.     ______________________________________

The 1,4-bis(3-aminopropylamino)-5,8-dihydroxyanthraquinone, lactose and corn starch (for mix) are blended together. The corn starch (for paste) is suspended in 600 ml. of water and heated with stirring to form a paste. This paste is then used to granulate the mixed powders. Additional water is used if necessary. The wet granules are passed through a No. 8 hand screen and dried at 120° F. The dry granules are then passed through a No. 16 screen. The mixture is lubricated with 1% magnesium stearate and compressed into tablets in a suitable tableting machine.

EXAMPLE 50

    ______________________________________     Preparation of Oral Suspension     Ingredient                 Amount     ______________________________________     Leuco-1,4- --bis(3-aminopropylamino)-5,8-dihydroxy-                                500   mg.     anthraquinone     Sorbitol solution (70% N.F.)                                40    ml.     Sodium benzoate            150   mg.     Saccharin                  10    mg.     Red dye                    50    mg.     Cherry flavor              50    ml.     Distilled water qs ad      100   ml.     ______________________________________

The sorbitol solution is added to 40 ml. of distilled water and the leuco-1,4-bis(3-aminopropylamino)-5,8-dihydroxyanthraquinone is suspended therein. The saccharin, sodium benzoate, flavor and dye are added and dissolved. The volume is adjusted to 100 ml. with distilled water. Each ml. of syrup contains 5 mg. of leuco-1,4-bis(3-aminopropylamino)-5,8-dihydroxyanthraquinone.

EXAMPLE 51 Preparation of Parenteral Solution

In a solution of 700 ml. of propylene glycol and 200 ml. of water for injection is suspended 20.0 grams of 1,4-bis[3-(dimethylamino)propylamino]-5,8-dihydroxyanthraquinone dihydrochloride with stirring. After suspension is complete, the pH is adjusted to 5.5 with hydrochloric acid and the volume is made up to 1000 ml. with water for injection. The formulation is sterilized, filled into 5.0 ml. ampoules each containing 2.0 ml. (representing 40 mg. of drug) and sealed under nitrogen.

EXAMPLE 52 1,4-Bis[2-(2-hydroxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone disuccinate salt

A mixture of 222 mg. of 1,4-bis[2-(2-hydroxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone, 118 mg. of succinic acid, and 50 ml. of ethanol is heated under reflux for 30 minutes to give the title compound.

EXAMPLE 53 1,4-Bis[2-(3-hydroxypropylamino)ethylamino]-5,8-dihydroxyanthraquinone dimalate salt

A mixture of 228 mg. of 1,4-bis[2-(3-hydroxypropylamino)ethylamino]-5,8-dihydroxyanthraquinone, 134 mg. of DL-malic acid, and 50 ml. of ethanol is heated under reflux for 30 minutes to give the title compound.

EXAMPLE 54 1,4-Bis[2-(2-hydroxypropylamino)ethylamino]-5,8-dihydroxyanthraquinone dilactate salt

A mixture of 228 mg. of 1,4-bis[2-(2-hydroxypropylamino)ethylamino]-5,8-dihydroxyanthraquinone, 120 mg. of 80% DL-lactic acid, and 10 ml. of ethanol is heated on a steam bath for 10 minutes, cooled, treated with 50 ml. of acetone and cooled to obtain the title compound.

EXAMPLE 55

    ______________________________________     Preparation of 50 mg. Tablets     Per Tablet                  Per 10,000 Tablets     ______________________________________     0.050          gm.     1,4-Bis[2-(2-hydroxyethyl-                                     500   gm.                  amino)ethylamino]-5,8-dihy-                  droxyanthraquinone dihydro-                  chloride     0.080          gm.     Lactose            800   gm.     0.010          gm.     Corn Starch (for mix)                                     100   gm.     0.008          gm.     Corn Starch (for paste)                                     75    gm.     0.148          gm.                        1475  gm.     0.002          gm.     Magnesium Stearate (1%)                                     15    gm.     0.150          gm.                        1490  gm.     ______________________________________

The 1,4-bis[2-(2-hydroxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone dihydrochloride, lactose and corn starch (for mix) are blended together. The corn starch (for paste) is suspended in 600 ml. of water and heated with stirring to form a paste. This paste is then used to granulate the mixed powders. Additional water is used if necessary. The wet granules are passed through a No. 8 hand screen and dried at 120° F. The dry granules are then passed through a No. 16 screen. The mixture is lubricated with 1% magnesium stearate and compressed into tablets in a suitable tableting machine.

EXAMPLE 56

    ______________________________________     Preparation of Oral Suspension     Ingredient               Amount     ______________________________________     1,4-Bis[2-(2-hydroxyethylamino)ethylamino]-                              500     mg.     5,8-dihydroxyanthraquinone dihydrochloride     Sorbitol solution (70% N.F.)                              40      ml.     Sodium benzoate          150     mg.     Saccharin                10      mg.     Red dye                  50      mg.     Cherry flavor            50      ml.     Distilled water qs. ad   100     ml.     ______________________________________

The sorbitol solution is added to 40 ml. of distilled water and the 1,4-bis[2-(2-hydroxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone dihydrochloride is suspended therein. The saccharin, sodium benzoate, flavor and dye are added and dissolved. The volume is adjusted to 100 ml. with distilled water. Each ml. of syrup contains 5 mg. of 1,4-bis[2-(2-hydroxyethylamino)ethylamino]-5,8-dihydroxyanthraquinone dihydrochloride.

EXAMPLE 57 1,4-Bis[2-(3-hydroxypropylamino)ethylamino]-5,8-dihydroxyanthraquinone diacetate salt

A mixture of 228 mg. of 1,4-bis[2-(3-hydroxypropylamino)ethylamino]-5,8-dihydroxyanthraquinone, 60 mg. of glacial acetic acid, and 50 ml. of ethanol is heated under reflux for 30 minutes to give the title compound.

EXAMPLE 58 1,4-Bis[2-(2-hydroxypropylamino)ethylamino]-5,8-dihydroxyanthraquinone diacetate salt

A mixture of 228 mg. of 1,4-bis[2-(2-hydroxypropylamino)ethylamino]-5,8-dihydroxyanthraquinone, 60 mg. of glacial acetic acid, and 10 ml. of ethanol is heated on a steam bath for 10 minutes, cooled, treated with 50 ml. of acetone and cooled to obtain the title compound. 

We claim:
 1. A compound selected from the group consisting of 1,4-bis[(2-aminoethyl)amino]-5,8-dihydroxyanthraquinone, the leuco base and tautomer thereof, and the pharmacologically acceptable acid-addition salts thereof.
 2. The aromatic free base according to claim
 1. 3. The leuco free base according to claim
 1. 4. The acid-addition salt of the aromatic base according to claim 1 wherein the acid is sulfuric acid.
 5. The acid-addition salt of the leuco base according to claim 1 wherein the acid is phosphoric acid.
 6. The acid-addition salt of the aromatic base according to claim 1 wherein the acid is hydrochloric acid.
 7. The acid-addition salt of the leuco base according to claim 1 wherein the acid is hydrobromic acid.
 8. The acid-addition salt of the aromatic base according to claim 1 wherein the acid is sulfamic acid.
 9. The acid-addition salt of the leuco base according to claim 1 wherein the acid is citric acid.
 10. The acid-addition salt of the aromatic base according to claim 1 wherein the acid is lactic acid.
 11. The acid-addition salt of the leuco base according to claim 1 wherein the acid is malic acid.
 12. The acid-addition salt of the aromatic base according to claim 1 wherein the acid is succinic acid.
 13. The acid-addition salt of the leuco base according to claim 1 wherein the acid is tartaric acid.
 14. The acid-addition salt of the aromatic base according to claim 1 wherein the acid is acetic acid.
 15. The acid-addition salt of the leuco base according to claim 1 wherein the acid is benzoic acid.
 16. The acid-addition salt of the aromatic base according to claim 1 wherein the acid is gluconic acid.
 17. The acid-addition salt of the leuco base according to claim 1 wherein the acid is ascorbic acid. 